I'm not a fan. They like to leak after a while. I'll use them for mocking up a system, though.
Band clamps arrived today. Better quality than I expected. If the pipe ends butt against each other squarely, then I’ll use these immediately AFTER the glasspacks for the last section of the exhaust pipe.
As far as the “ugly factor” goes, they are tucked up under the bed far enough to stay out of sight.